<template>
	<div class="todo-footer" v-show="allCount> 0">
		<label>
			<input type="checkbox" :checked="isAllDone" @change="changeAll" />
		</label>
		<span> <span>已完成{{isDoneCount}}</span> / 全部{{allCount}} </span>
		<button v-show="isDoneCount > 0" class="btn btn-danger" @click="removeAllIsDone">清除已完成任务</button>
	</div>
</template>

<script>
	export default {
		name: "TodoFotter",
		props: ['todos', 'updateAllDone', 'deleteAllIsDone'],
		computed: {
			allCount() {
				return this.todos.length;
			},
			isDoneCount() {
				return this.todos.reduce((pre, current) => {
					return pre + (current.done ? 1 : 0);
				}, 0);
			},
			isAllDone() {
				return this.allCount > 0 && this.isDoneCount === this.allCount;
			}
		},
		methods: {
			changeAll(e) {
				// this.updateAllDone(e.target.checked);
				this.$emit('updateAllDone',e.target.checked);
			},
			removeAllIsDone() {
				if (confirm('确定清除所有已完成待办吗？')) {
					// this.deleteAllIsDone();
					this.$emit('deleteAllIsDone');
				}
			}
		}
	};
</script>

<style scoped>
	/*footer*/
	.todo-footer {
		height: 40px;
		line-height: 40px;
		padding-left: 6px;
		margin-top: 5px;
	}

	.todo-footer label {
		display: inline-block;
		margin-right: 20px;
		cursor: pointer;
	}

	.todo-footer label input {
		position: relative;
		top: -1px;
		vertical-align: middle;
		margin-right: 5px;
	}

	.todo-footer button {
		float: right;
		margin-top: 5px;
	}
</style>